Because males were returning from war, the females who previously held the males' positions in factories, etcetera, were either forced out of these jobs, or were permitted to keep them, a trend that destroyed the idea of the "stay-at-home mom".
The Public Relations Society of America (PRSA) is an organization that was formed in 1947, headquartered in New York and remained as the largest professional organization serving the field. The formation of this organization was brought by the Postwar Era.